Lubricating apparatus



A. P. Fox l-:r AL.

I LUBRICATING APPARATUS Filed Feb. :5. 19:54

4Q ro 554mm um, Q

INJECTO PUMP l lmzs; 1935.

@NRE KOFOKPZOO mow Patented Oct. 29, 1935 s PATENT OFFICE LUBBICATINGAPPARATUS This invention relates to lubricating apparatus Alexander P.Fox, University City, and Foster Holmes, Normandy, Mo., assignors toLincoln Engineering Company, St. Louis, Mo., a corporation oi' MissouriApplication February a, 1934. sum1 N. 109,516

1s claim. (ci. isa-'n by uuid from the respecuveune s or n.

Each

and with regard to certain more specic features, to lubricatingapparatus operable to distribute controlled quantities of lubricant orthe like to two or more pipes, under pressure.

The invention is an improvement upon the structure described in UnitedStates Patent 1,805,303, issued to Frank S. Barks, dated May 12, 1931,and United States Patent 1,990,986, issued to Alexander P. Fox, datedFebruary 12, 1935, for Lubricating apparatus.

Among the several objects of the invention may be noted the provision ofapparatus of the class described which is self-timed and self-actuatingto effect complete single cycles oi.operation, asdistinguished frommulti-cycle operations or fractional cycle operation; and the provisionof apparatus of the class described which is simple and reliable. Otherobjects will be in part obvious and in part pointed out hereinafter.

The invention accordingly comprises the elements and combinations ofelements, features of construction, and arrangements of parts which willbe exemplified in the structures hereinafter described, and the scope ofthe application of which will be indicated in the following claims.

In the accompanying drawing, in which is illustrated one of variouspossible embodiments of the' invention, the single gure is a schematiclayou Similar reference characters indicate corresponding partsthroughout the drawing.

Inasmuch as the essential features oi' the hydraulic parts of theinvention have already been described in detail in said patents, thesewill be iescribed herein in -terms of operation as rolows:

Broadly, there is provided a fluid supply Y from which fluid iswithdrawn by means of a pump P and delivered to a line 23, through astrainer 3 and to an inlet 65 and to an alternating distributor i, therebeing within the distributor I a directing valve 15 which directs fluidinto one or the other of outlet lines 9 or Il. -These lines 9 and IIcorrespond to similar lines in said Patent 1,805,303. From theselinesthe grease is measured out inpredetermined quantities by suitablemeasuring injector pumps or valves PU. Further detailed description oi'valves PU is believed to be unnecessary in view of the detaileddescription'in United States Patent 1,935,150, issued to Alexander P.Fox and William Z. Linders, dated November 14, 1933.

Each line 9 and I I is provided with a branched pressure regulatingresistance valve operated of these resistance valves permits thepressure in its respective line to build up to a predetermined maximum,after which the respective valve operates to release and shunt fluidfrom the line s under pressure to operate said directing valve so thatthe latter redirects iiuid into the other line. The outlet line which isnot in communication with the inlet 05 is exhausted to the supply by thedirecting valve 15, whereby the back pres- 10 sure of iluid in that lineis relieved or reduced. Also, means is provided whereby the fluid usedfor operating the directing means is relieved of pressure andre-delivered to the supply after it hasceased its function oi' shiftingthe directing 15 valve.

Speciilcally, the pump P is actuated by an electric motor M actingthrough a suitable speed reducer S. 'I'he motor circuit L is adapted tobe opened by a pressure responsive switch W under predeterminedconditions of pressure in a line I9. Further electrical circuit featuresare comprised in the invention and will be particularized hereinafter.

In the drawing, the dark stippling indicates grease under high pressure,and the light stippling indicates grease under a lower release pres- Asshown, lubricant, such as grease, or like material, enters underconsiderable pressure through the inlet 23, and passes into and throughthe filter I. The motor M and the pump P build up the pressure whilethey are running. Next, the filtered grease passes through the inletline 05 and reaches an annular region 63 formed by a as groove 19 inpiston valve stem 19.

Depending now upon the position of the piston 15, which determines theposition of groove 19, the grease passes, by way of said groove 19, toeither a passage 85 or a passage 81. For the 40 present, the grease willbe considered as passing to the passage B1 implying that the valve 15 isin a position opposite to that shown. The passage 81 conducts the greaseto delivery pipe II. It will be assumed that the pipe II, and devicesconnected thereto, are already lled with grease, so that pressure ispromptly built up in line II. This pressure forces some of the greaseout through the respective passage 95 to approach the space provided bycounterbore 91 but'here it 50 is stopped by the valve element 13|. Thepressure of grease builds up until it is great enough to unseat the`valve element III against spring |21, which has been set at apredetermined pressure by manipulation of adjusting plug ill. It

will be noted that the backingplugs IIS for the springs |21 are screwthreaded into the bodies which hold the springs. Unseating of the valveelement I3I moves pin I2 I, and hence gives a visible signal at theexterior of the device.

Having unseated valve element |3I, the grease passes into counterbore91. After unseating, the area pressed against by the grease isincreased. Hence with the small projected area at |31 when the valve |3|is closed, la relatively small spring |21 may be adapted to maintainclosure against high pressures but after opening, the increased areapresented insures maintenance of opening. With the upward movement ofthe pin I2I, its lowermost, narrowest portion |29 is moved so v that apassage is provided therearound from bore shown in the drawing torepresent this last con- 91 through bore |49, to annular region |41. Anexhaust opening I5I vhis; meanwhile been shut oi! by plug |52.

From the annular space |41 the grease is now compressed through passage|59 into a central, mainbore 91 which holds valve 15, but in this caseat the end oi Said bore. As the grease fills the bore 51, it exerts apressure upon the end of piston element 15, and ultimately drives saidpiston to the left to the other end of the bore 51. 'Ihis change ofposition of the piston 15 changes the position oi' notch 19 to theextent that lubricant is now directed into line and pipe 9, instead ofinto line 91 and pipe II. Also, pressure is relieved in line II by notch19 in valve 15. Relief occurs through a check valve |89 to a return lineI5 leading to the supply. The parts are dition.

The pressure in line 9 is communicated to pump PU, as well as to itsrespective valve I3I to liftv the same and to causedeliveryhof a chargeto the opposite end of the pistonvalve 15, thus returning the valve 15to the original position. 'Ihe -return causes a groove 11 to be alignedwith passage 83 so that pressure is relieved in the pipe 9 through thecheck valves |59 and |91 to the return pipe I5. At the same time thesurge engendered as this high pressure is relieved, is notinstantaneously dissipated, because of friction in the lines and theresistance of check valves |59 and |81. Hence instantaneous building upof pressure occurs in a branch line I9 which leads to the switch W. Thiscauses opening of the switch W and deenergization oi the motor M as willbe further particularized. It will thus be seen that the 'apparatus hasmade a complete cycle of operation and then is automatically cut out ofoperation by its own functions.

The surge abve referred to is dissipated through the check valves |59and |91 shortly after occurring. 'Ihis causes a reclosing oi the switchW but by this time independently controlled apparatus.. in the line Lcauses an opening ofthe circuit at another point. This apparatus in con-'nection with line L will be described shortly. Thus, although theswitch W is closed to potentially restart the motor M, the circuit L isopen. Restarting is eiected by said other means in the line.

When alternation takes place, the supply of high pressure grease is atonce cut oi! from the back to passage |59, annular space |41, bore |5|.

passage |53, check valve |99 to exhaust I5, thus relieving the pressure.

' In order to prevent the piston 15 from at any time being heid on deadcenter (such that grease is supplied to neither passage 85 nor passage91), the notch 19 is preferably made a little longer than the distancebetween the closest edgesof passages 85 and 91, so that it is, at alltimes, necessarily in communication ywith one of said passages.

The check valves |81 and |99 prevent the surge engendered by the releaseof high pressures in therespective lines 9 and II from being improperlydelivered to the opposite ends of the valve15. They prevent the valve 15from being balanced after partial movement by the pressure engendered ateachend by the surge effected when relieving the respective lines 9 orI| of pressure. Thus these respective check valves |91 and |89 eachprotect one end of the valve stem from being subjected to the surge orexhaust pressure while the other end is being acted on by pressureshunted from the lines 9 or under pressure.

As to the check valve |59, it will be noted that it has no counterpartin the passage |64, because the passage |54 does not communicate withany linev such as I9. As will be remembered, the line I9 communicatesback pressure to the pressure switch which controls the operation of acompressor for delivering grease to the inlet line 23. The check valve|59 prevents pressure of trapped grease which is exhausting from behindthe adjacent or lower end of valve stem 15 from reaching passage I9,said returning grease being delivered through the check valve |81 to theline I5.

'I'he combination of parts indexed on the drawing as pump, reservoir,iilter, resistance pressure regulator and distributing valve are shownand claimed in said Patent 1,990,986.

It is the purpose of the present invention to combine with the aboveapparatus, a timing apparatus, such that the motor M is energized onlyfor whole, single cycles of action of the valve 15, and thus to obtainexactly measured quantities forced into lines I2 and I3 by the pump PU,rather than unknown and variable quantities. 'I'he circuit foraccomplishing this end is shown at L.-

The circuit L comprises a line circuit 29| serving the motor M. At thispoint, it is to be understood that said line circuit 29| may open andclose a solenoid air valve, if it be desired to control an air enginewhich may be used for actuating the pump P instead of the motor M. Theline circuit 29| may be referred to as a motorizing circuit forinitiating and maintaining pump action.

Lines 293 indicate a time-switch circuit foi the motor of an adjustabletime switch 295 This switch motor revolves continuously.

Lines 291 indicate a momentary contactor circuit. 'I'he momentarycontactor circuit 251 feed: the motor of a momentary contactor mechanism299 by way of contacts 221 of said adjustable time switch 295. Thecontacts 221 are in circuit 291.

Numerals 2|| indicate a magnetic switch pickup circuit energized throughthe switch 233 o1 said momentary contactor 299. The contact: 233 are 1ncircuit 2I'I.

Numerals 2I3 indicate a magnetic switch keer and break circuit havingtherein the contact 2|! of the pressure switch W.

A magnetic contactor 2I1 is used to make an( breakthe motor circuit andalso to complet circuit 2I3, said contactor being normally held open bya spring 2I9 and closed by the magnetic action of a coil 22| in themagnetic switch pickup circuit 2| I.

Referring to the adjustable time switch 205, it will be seen to comprisea pair of adjustable cams 223 controlling by their rotation and by theirrelative positions a pair of leafspring followers 225, said followerscontrolling the opening and closing of the contact points 221.

'I'he 'momentary contactor 209 comprises a motor driven cam 229 whichcontrols a leaf spring follower 23| for controlling opening and closingot the contacts 233. The period of closing oi the switch contacts 233 ispreferably slower than the period of closing of switch contacts 221.This is because the angular velocity of cam 229 is less than that of thecams 223. Hence the cam 229 may revolve-only a part of 360 degrees forevery 360 degrees of movement of cams 223. Also, relative adjustment ofcams 223 determines the time of closure of contacts 233 and thisdetermines the advance of cam 229 per revolution of cams 223.

'Ihe operation of the circuit is as follows:

'Ihe line 20| is suitably energized. The motor M is not running becausethe magnetic contactor 2|1 is open. However, the time switch circuit 203is always closed through the motor of time switch 205. Thus the motor oftime switch 205 is rlmning continuously. 'I'he relative adjustment ofthe pair of time switch cams 223 is such that the contacts 221 areclosed for a suitable period of time, say at intervals of one minute.Closing of the contacts 221 causes energization of the momentarycontactor circuit 201, thus causing rotation of the motor of themomentary contactor 209 so as to ultimately close -the contacts 233 bymeans of 'cam 229. It is to be understood that several cyclic closuresof contacts 221 may be required to cause a closure of contacts 233.closure of contacts 221 which in turn depends upon the adjustment ofcams 223. It also depends upon the period of cam 229.

Closure oi the contacts 233 results in the magnetic switch pick-upcircuit 2|| being energized to close the magnetic contactor 2 I1,whereby the motor M is energized to cause the pump P to operate.'

As soon as the circuit 2I| becomes energized,A the'magnetic switch keepand break circuit 2I3v also becomes energized, through the now closedcontactor 2I1, and this circuit also includes the holding coil 22| sothat the magnetic contactor 2 I 1 remains shut against the action of itsholdout spring 2|9, as long as the contacts 2|5 of pressure switch W areclosed. .Under these circumstances, the momentary contactor 209 maycause reopening of the contacts 233 without affecting the closedcondition of the magnetic contactor 2|1.

In view of the above, it will be seen that the motor M will run andcause the distributing valve I to operate, andthe latter will passthrough one cycle of operation, aiter which the described surge in lineI9 will operate the pressure switch W so that its contacts 2|5 part,thereby to open the magnetic switch keep and break circuit 2I3. 'Ihesolenoid 22| becoming deenergized permits the magnetic contactor toreopen under action oi' its spring 2|9. 'I'he motor circuit is thusopened and pumping positively ceases and another cycle of action of thedistributor is prevented. A further consequence is that cyclic actiondoes not start in the mid-portion of a cycle.

' In the meanwhile, the adjustable time switch The number dependsupon'the time of4 205 has been continuing to move so that after apredetermined open period. the contacts 221 again close and the cyclerepeated, but perhaps requiring several revolutions of cams 223 in orderto cause cam 229 to again operate the contacts' The reason for using themomentary contactor 209 in conjunction with the time switch 205 is togain a range of adjustments of cyclic periods which would otherwise bexed by the initial rate assigned to the time switch 205, if, as mightbe. the contacts 221 were used to energize coil 22|. For instance, ifthe gearing in the momentary contactor 209 is such that the cam 229 hasa lower angular velocity than the angular velocity of cams 223, then itmay require a plurality oi' closures of contacts 221 (revolutions ofcams 223) in order to cause one closure of switch 233 (revolution of cam229) And it will be noted that the relative adjustment of cams 223determines the time of closure of contacts 221 and hence the time duringwhich advance of cam 229 takes place per revolution of cams 223. Hencethe angie of advance of the cam 229 per closure of switch 221 is afunction oi' the angular adjustments between cams 223. II.'v the advancetime of cam 229 is relatively great, the contacts 233 will closeoftener; whereas if the tim'e of advance is relatively less, thecontacts 233 will close less often. The time is controlled by theadjustment of cams 223. Thus is effected a wider range of periods ofclosure of contacts 223 than could be had were the contacts 221 used todirectly energize the coil 22 I.

From the above it will be seen that there is an assurance that atadjustable predetermined intervals of time the switches 205 and 209 willoperate to cause energizationv of the motor M. The motor M will beenergized as long as the pressure switch W is not under influence of anymomentary surge such as determines the completion of one cycle ofoperation of the distributing valve Only after such a cycle has beencompleted will the momentary opening of pressure switch W cause openingof the motor circuit. Furthermore, the pressure action on the switch Wneeds'only be momentary (a surge), because upon the contacts 2I5reclosins. the magnetic contactor 2|1 has opened the circuits 2II, 2I3,until the cycle is again initiated by a complete revolution of thecontactor 209.

Among the advantages of the invention are the following:

l. At speciiically timed intervals and not otherwise the pump P isstarted so as to feed iluid through the distributingV valve I to theinjector pump. PU. the latter receiving a charge at both ends because ofthe complete cyclic operation of the distributing valve 2. 0nce theoperation of the distributing valve I is started, it continuesthroughout one complete cycle so as to ensure all bearings receivinglubricant, regardless of the further action of the time switch 205 andthe momentary contactor 209.

3. After the distributing valve I has/completed one cycle, the pumpceases to operate and thus there is no possibility of several cycles ofoperation occurring to overload the bearings and cause waste oflubricant.

4. There is no possibility of a distributing valve I ceasing norstarting operation in the mid-part of a cycle.

5. All bearings receive predeterminately calcuvils 6.Thepressureiniinesaand II may beregulated so as to meet variousresistances in lines v I2 and I3 without interfering with the accuratelytimed action.

7. A wide variation of timing of the cycles oi action is possible by theuse o! the combination of devices 205 and 209.

While -the device has been herein described in yconnection with thehandling or lubricants, particularly grease, it will be apparent thatother uids might also b e handled without departing from the neld oftheinvention.

Period of closure is herein dened as the time that all matter containedin the above description or shown in the accompanying drawing shall beinterpreted as illustrative and not in a limiting sense.

We claim:

l; In lubricating apparatus. a lubricant supply, a pump adapted toforcelubricant from said supply. a hydraulic system adapted to receive saidlubricant, a pressure switch, means in said hydraulic lsystem wherebysaid pressure switch is temporarily opened for each cycle of action ofsaid hydraulic system. a drive for the pump, an electrical circuit i'orinitiating action of the driving means, adjustable timing means adaptedto periodically temporarily close said circuit to eifect saidinitiation, said pressure switch being adapted to maintain closure oisaid circuit after temporary closure thereof by said timing means, andmeans for automatically opening the circuit when said pressure switchtemporarily opens.

2. In lubricating apparatus, a lubricant supply, a pump adapted to torcelubricant ironr said supply, a hydraulic system adapted to receive saidlubricant, a pressure switch, means in said hydraulic is temporsystemwhereby said pressure switch oi said hyarily opened -for each cycle ofAaction draulic system. a drive for the pump, an electrical.

circuit for initiating action ot the driving means, timing means adaptedto periodically temporarily close said circuit to eii'ect saidinitiation, said pressure switch being-adapted to maintain closure ofsaidcircuit after temporary closure thereor by said timing means. andmeans for automatically opening the circuit-when said pressure switchtemporarily opens at the end oi each cyclic action of said hydrauliccircuit. f

3. In apparatus ot the class described, compression means, an electricsystem adapted to initiate and maintain action of said compressionmeans, a pressure switch controlling said system, a body having aninlet, said compression means supplying iiuid to the inlet, said bodyalso having a plurality o! outlets, a plurality of exhausts and apressure switch connection, a movable distributing valve in said bodyadapted in alternate positions to connect the inlet with one outletwhile independently connecting the other outlet to one or saidexhausts,resistance valves associated with said outlets adapted to assume openand closed positions, means connecting said outlets with opposed areason the distributing valve whereby movement of the distributing valve iseiIected under outlet pressure when the respective resistance valves areopen, means connectingV said distributing areas to the respectiveexhausts when said resistance valves are closed, a throttle connectionopening'irom said switch connection to one of said exhausts, a port onsaid distributing valve adapted in one position of said distributingvalve to connect one of said outlets with the pressure switch connectionwhen said distributing valve is in exhaust position with respect to thelast-named outlet, said electric system comprising a motorizing circuit,a magnetic contactor therein, a magnetic coil for holding closed saidcontactor, an adjustable time switch adapted to operate continuously, a.momentary contactor controlled by said time switch, said momentarycontactor energizing said coil to close the magnetic contactor, saidpressure switch being normally closed and thus adapted to maintain themagnetic contactor in closed position, and means for opening themagnetic contactor when said pressure switch temporarily opens undersurge conditions in the pressure switch line due to said throttleconnection. i

4. Apparatus made in accordance with claim 3 and. including regulatingmeans for said resistance valves adapted to determine the outletpressures at which the respective valves shall open without aecting thetiming ci electrical operation.

5. Apparatus made in accordance with claim 3 and including means forindependently regulating the resistance of said resistance valves tocontrol the respective pressures in the respective outlets at which saidrespective resistance valves shall open, without ail'ecting the timingoi' said adjustable time switch.

6. In apparatus of the class described, a iluid reservoir having anoutlet, a hydraulic system connected with said outlet adapted tocperatecyclically, a pressure switch, said hydraulic system operating saidpressure switch to open temporarily after each cycle of operation, apump adapted to pump fluid from said reservoir and deliver it to saidhydraulic system, 'means for driving said pump, an electrical circuitfor initiating energization of said pump driving means, an automaticallyopening magnetic contactor in said circuit, a holding coil adapted tohold said contactor closed, the contact o! said pressure switch being inseries with said holding coil, a time switch, means for energizing saidtime switch, means adapting said time switch to temporarily energizesaid holding coil when the magnetic contactor is open, said pressureswitch per- `manently energizing said holding coil when its contacts areclosed and aiter the holding coil has been initially energized, but whenopened effecting the reopening of said magnetic contactor.

v'1. In apparatus ot the class described, a fluid reservoir having anoutlet, a hydraulic system connected with said outlet adapted to operatecyclically and to produce a surge once per cycle,

a pressure switch subject to and opened temporarily by said surge, apump adapted to pump fluid from said reservoir and deliver it to'saidhydraulic system, means for driving said pump,

an electrical circuit for initiating energization of said pump drivingmeans, an automatically opening magnetic contactor in said circuit, aholding coll adapted to hold said contactor closed, the contact i saidpressure switch controlling said holding coil, a time switch, means forenergizing said time switch, means adapting said time switch a. Inapparatus of the class described, a, fluid reservoir having an outlet, ahydraulic system connected with said outlet adapted to operatecyclically to produce a surge, a normally closed pressure switch subjectto the surge and adapted to open in response thereto, a pump adapted tol-pump iluid from said reservoir and deliver it to said hydraulic systemto cause the system to operate, means i'or driving said pump, anelectrical circuit for energizing the driving means for said pump, acontactor in said circuit, means adapted to close said contactor and sohold it including said pressure switch, and means to cause the contactorto open and remain open when the pressure switch is temporarily opened.

9. In apparatus of the class described, a uid reservoir having anoutlet, a hydraulic system connected with said outlet adapted to operatecyclically, a pressure switch, said hydraulic system operating saidpressure switch to open temporarily after each cycle oi operation, apump adapted to pump fluid from said reservoir and deliver it to saidhydraulic system, means ior driving said pump, an electrical circuit forinitiating energization of said pump driving means, an automaticallyopening magnetic contactor in said circuit, a holding coil adapted tohold said contactor closed when the coil is energized, the contactI ofsaid pressure switch being in series with said holding coil, anadjustable timing switch to operate to make and break a circuit, meansfor energizing said timing switch, a momentary contactor energizedintermittently by said last-named time switch circuit to temporarilyenergize said holding coil from time to time to close the magneticcontactor, said pressure switch'further energizing said holding coilafter each closure thereof and causing the holding coil to reopen whenthe pressure switch opens.

10. In apparatus ofthe class described, a fluid reservoir having anoutlet, a hydraulic systemY connected with said outlet adapted tooperate cyclically, a pressure switch, said hydraulic system operatingsaid pressure switch to open temporarily after each cycle oi' operation,a-pump adapted to pump fluid from said reservoir and deliver it to saidhydraulic system, means for driving said pump, an electrical circuiti'or initiating and maintaining energization of said pump driving means,a magnetic contactor in said circuit, a holding coil adapted afterclosure of said contactor to hold the samefclosed, the contact of saidpressure switch when closed energizing said holding coil, a time switch,a circuit therefor, means for energizing said time switch to repeatedlymake and break its circuit, a. momentary contactor switch in the switchtime circuit, a contactor circuit therefor, said holding coil beinginitially and temporarily energized by said contactor switch afterclosure of the con tactor switch by repeated operations of the timeswitch, said holding coil being maintained in energized condition afterreopening oi 4the contactor switch by a closed condition oi' thepressure switch and being deenergized when said pressure switch opens.

11. In apparatus oi the class described, a iiuid reservoir having anoutlet, a hydraulic system connected with said outlet adapted to operatecyclically, a pressure switch, said hydraulic system operating saidpressure switch to open temporarily after each cycle o f operation, apump adapted to pump fluid from said reservoir and deliver it .to saidhydraulic system, means for 5 driving said pump, an electrical circuitfor initiating and maintaining energization oi' said pump driving means,a magnetic contactor in said circuit, a holding coil adapted afterclosure of said contactor to hold the same closed, the contact of saidpressure switch when closed energizing said holding coil, a time switch,a circuit there# for, means for energizing said time switch torepeatedly make and break its circuit, a momentary contactor switch inthe time switch circuit, a contactor circuit therefor, said holding coilbeing initially and temporarily energized by said contactor switch afterclosure of the contactor switch by repeated operations of the timeswitch, said holding coil being maintained in energized condition onlyby a closed condition of the pressure switch and being deenergized whensaid pressure switch opens, the period of the contactor switch being ina fixed ratio les than that of the timing switch.

12. In apparatus oi the class described, a iiuid reservoir having anoutlet, a hydraulic systemv connected with said outlet adapted tooperate cyclically, a pressure switch. said hydraulic system operatingsaid pi essure switch to open temporarily after each cycle of operation,a pump adapted to pump fluid from said reservoir and deliver it to saidhydraulic system, means for driving said pump, an electrical circuit iormitiating and maintaining energization of said pumpI driving means, amagnetic contactor in said cir` cuit, a holding coil adapted afterclosure of said contactor to hold the same closed, the con-s tact ofsaid pressure switch when closed ener` gizing said holding coil, a timeswitch, a circuit therefor, means for energizing said time switch torepeatedly make and break its circuit, a momentary contactor 'switch inthe time switch circuit, a contactor circuit therefor, said holding coilbeing initially and temporarily energized by said contactor switch,after closure of the con-v taotor switch by repeated operations of thetime switch, said holding coil being maintained in eny ergized conditiononly by a closed condition of the pressure switch and being deenergizedwhen said pressure switch opens. the period of the contactor switchbeing in a ilxed ratio less Athan that of the timing switch, and meansfor adjusting the period of timing switch closure.

13. In lubricating apparatus, a pump, means 55, `for driving the pump,an electric circuit includJ ing means for initiating movement of thedriving means, a constantly operating timing switch repeatedly closingaccordingly to a predetermined period and for predetermined times, 0means i'or adjusting the times of closure, a circuit connected with saidtiming switch, a momentary contactor 'driven irom said timing switchcircuit and controlling said initiating means, the period of closure orsaid momentary contactor while being driven being slower than the periodof closure of said timing switch wnile Operating."

14. In lubricating apparatus, a pump, means for driving the pump, anelectric circuit includ- 7 ing means for initiating movement of thedriving means, a constantly operating timing switch repeatedly closingaccording to a predetermined period, a circuit connected with saidtiming switch, a momentary contactor driven from said u timing switchcircuit and controlling said initiating means, the period of closure ofsaid momentary contactor while being driven being slower than the periodo! closure oi said timing switch while running.

15. In lubricating apparatus, a pump, means for driving the pump, anelectric circuit including means for initiating movement of the -drivingmeans, a constantly operating timing switch closing according to apredetermined period, means for adjusting the time of closure duringeach period, a circuit connected with said timing switch, a momentarycontactor driven from said circuit and controlling said initiatingmeans, the period of closure oi' said momentary contactor while beingdriven being slower than the period of closure of said timing switchwhile running, a pressure switch, means whereby said pressure switchwhen closed maintains closure of said initiating circuit and means foropening said initiating circuit when said pressure switch is open.

16. In lubricating apparatus, a pump.,means for driving the pump, anelectric circuit including means for initiating movement oi the rdrivingmeans, a constantly operating timing switch closing according to apredetermined period, means for adjusting the time oi.' closure duringeach f period, a circuit connected with said timing switch,

17. In lubricating apparatus, a pump, means for driving the pump, anelectric circuit including means vfor initiating movement oi thedrivingv means, a constantly operating timing switch clos- I ingaccording to a predetermined period, a circuit controlled by said timingswitch, a momentary contactor driven from said circuit and periodicallycontrolling said initiating means, the period of said momentarycontactor being slower than the period of said timing switch whilerunning, a 10 pressure switch, said pressure switch being subjected topressure engendered by said pump, and periodically operating uidcontrolling means be-v tween said pump and said pressure switch wherebysaid pressure is applied to said pressure switch in perodic surgesaccording to periodic movement oi' said fluid controlling means.

18. In lubricating apparatus, a pump, means fordriving the pump, anelectric circuit including means for initiating movement oi the drivingmeans, a constantly operating timing switch closing according to apredetermined period, a circuit controlled by said switch, a momentarycontactor driven from said circuit and periodically controlling saidinitiating v means, the period of said momentary contactor being slowerthan the period oi' said timing switch while running, a pressure switch,said pressure switch being subjected to pressure engendered by saidpump, periodically operating uid controlling means between said pump andsaid pressure switch whereby said pressure is applied to said pressureswitch in periodic surges according to periodic movement of said uidcontrolling means and means for azusting the intervals of closure oisaid timing switch.

ALEXANDER P. FOX. FOSTER HOLMES.

